diff --git a/src/runtime/error.rs b/src/runtime/error.rs
index 1284844b8dbbeb6f808f3c37c23095758a84ea32..59bca37f40dc3ddf0db08b6f5c800ded8618b10c 100644
--- a/src/runtime/error.rs
+++ b/src/runtime/error.rs
@@ -17,6 +17,7 @@ pub enum ConnectError {
 #[derive(Eq, PartialEq, Copy, Clone, Debug)]
 pub enum AddComponentError {
     DuplicatePort(PortId),
+    NoSuchModule,
     NoSuchComponent,
     NonPortTypeParameters,
     CannotMovePort(PortId),